1. A microfluidic apparatus for providing one or more substance liquids to a microfluidic channel network, the microfluidic
apparatus comprising the microfluidic channel network, at least one first substance liquid inlet, a second substance liquid
inlet, at least one first inlet valve, a second inlet valve, and at least one input device for continuously applying a substantially
constant pressure or a substantially continuous flow to the at least one first substance liquid at the at least one first
substance liquid inlet,

wherein the microfluidic channel network comprises a substance liquid combining area, the substance liquid combining area
being connected to a droplet generation junction, and wherein the at least one first inlet valve is switchable between a first
position, in which a liquid connection from the at least one first substance liquid inlet to the substance liquid combining
area-is open, and a second position, in which the liquid connection from the at least one first substance liquid inlet to
substance liquid combining area-is closed,

wherein the second inlet valve is switchable between a first position in which a liquid connection from the second substance
liquid inlet to the substance liquid combing area microfluidic channel network is open, and a second position, in which the
liquid connection from the second substance liquid inlet to substance liquid combining area the microfluidic channel network
is closed.